Based on the switched LAN, this paper introduces the relationship between VLAN and switch and the data frame structure of IEEE 802.1Q VLAN, analyzes the characteristics of switch forwarding and filtering frames between different ports according to VID in the data frame, and discusses the working principles of ingress processing, forwarding processing and egress processing in detail. On this basis, through specific application examples, it describes the link and port types of IEEE 802.1Q VLAN equipment and the data forwarding process between different ports in VLAN. This study has guiding significance for network engineering designers and network administrators to systematically master the principles and applications of VLAN technology.
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